docs: def com_google_fonts_check_metadata_subsets_order(family_metadata):
    """METADATA.pb subsets should be alphabetically ordered."""
    expected = list(sorted(family_metadata.subsets))
  
    if list(family_metadata.subsets) != expected:
      yield FAIL, ("METADATA.pb subsets are not sorted "
                   "in alphabetical order: Got ['{}']"
                   " and expected ['{}']").format("', '".join(family_metadata.subsets),
                                                  "', '".join(expected))
    else:
      yield PASS, "METADATA.pb subsets are sorted in alphabetical order."